Multiply reenforced paper



July 3, 1923.

A. F. SCHENKELBERGER MULTIPLY REENFORCED PAPER Filed April 6, 1920 v Patented duly 3, l9..

MET E. SCHERKELBERGEJE, 01F

i to i onrncr, MASSACHUSETTS, assronon no snracn limits, or nearest, massacnusnrrs, a conrona'rron or nassasnrrs.

MULTIPLE REENJE'ORCED PAPER.

Application filed April 6, 1920. Seriallto. 371,680.

drawings representing like parts in each of the several views.

This invention relates to multi-ply papers adapted for wrapping, lining, and like uses wherein a plurality of layers of paper are unitedadhesively by a suitable cementitious binder which maybe of asphalt applied hot,

or where water-proofing is notre uired, it

may be of glue or like adhesive. apers of these kind have hitherto been made with reinforcing threads or filaments interwoven between the layers of a duplex paper and extending lengthwise of the paper web at intervals, and such reinforcing filaments have also been applied in crisscross relation in a duplex paper. So far as I am aware, however, no multi-ply paper has been lmown wherein there is available the strength and reinforcing qualities both of the lengthwise extending threads of one duplex paper and hill of the criss-cross threads of another duplex aper united thereto in continuous and unbrokenlengths. The principal object of the present invention is, to provide a multiply reentorced paper composed of four or more '-layers of paper cementitiously, united into a single web with lengthwise extending filaments between two of the layers apd with criss-cross filaments extending continuously of the lengthof, and between others of the paper layers whereby the composite web thus produced is strengthened to a maxi mum degree in every direction by the filaments as'well as by the multiple layers of paper themselves. A further object is to provide an im roved method of manufac-' turing multi-p reenl'orced paper in continuous webs oil uniform strength throughout. The foregoing and other objects and advantages of the invention will more fully appear from the following detailed description, and the distinctive features of novelty will be thereafter pointed out in the appended claims.

cross arrangement of reinforcing thus produced Referring to the drawings:

Fig. 1 is a diametrical longitudinal view with parts in vertical section showing an apparatus for producing the multi-ply paper of the invention.

Fig. 2 is an elevation with portions broken.

away in section showing one form of multiply paper embodying the invention;

Fig. 3 is a similar view showing another form of the invention; and i Fig. l is an edge View of a part per web broken away as indicated 2 and 3. i

Tn carrying out my invention provide a duplex paper web 10 which may be pro-' duced as usual of two paper layers 10 l0" cementitiously united by asphaltic cement or other suitable binder and with lengthwise reinforcing threads or filaments interposed between such layers and imbedded in the binder. I provide a second duplex web 12 likewise composed of two layers of adhesively united paper 1212", these layers of the pain Figures having L interposed between them a criss- I filaments as indicated at 13. These fi aments as shown in Figure 2 extend diagonally of the web in opposite directions, while in Figure 3 and as indicated at 13' these filaments ex: tend straight, crosswise and lengthwise of the panel. The duplex reenforced webs are cementitiously united together either by the same End of binder as used for the original duplexing of the paper, or by .3, difierent adhesive or cement if desired. As shown in Fig. 1, one du lex web 10 is drawn from a paper roll Rtl irough a coating station 14 where it is engaged by a coating roll partly ersed in a tank 14 containing the adhesive or binderto be applied. The other duplex web 12 is drawn from a roll R and may if desired also be led through a coating station 15, though this coating may be dispensed with, and thence the two webs are led between a pair of press rolls 16 and united to form a four ply reenforced web 17 which may be led onto a inc take-on roll R or otherwise taken care of,

In this way a multi-ply reenforced web may be produced continuously and rapidly and with all parts of the web exhibiting the combined strength of all the paper layers and. also of all the series of filaments extending lengthwise of the Web and transversely thereof. I consider the form of the invention as shown in Fig. 2 of special value and importance since thereby the strength imparting qualities of the filaments are utilized to the best advantage by reason of the special and relative arrangement of the longitudinal filaments 11 of one duplex paper with the criss cross diagonal filaments 13 0f the other duplex paper. I am awarerthat the invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof; and I therefore desire the present embodiment to be considered in all respects as illustrative and not restrictive, reference being had to the appended claims rather than to the foregoing description to indicate the scope of the invention.

Having described my invention, what I claim as new and desire to secure by Let- In testimony whereof, I have signed my name to this specification.

ALBERT r. sonnnimilennena.

length of the Web imbedded 

